    <!-- <div id="left"> -->
	    <div style="display: flex; flex-direction: row; width: 100%;">
        <div id="btn_praxen" class="active">Praxen</div>
        <div id="btn_aerzte">&Auml;rzte</div>
	    </div>
    <!-- </div> -->

	  <!-- <script type="text/javascript" src="jquery/jquery-1.11.2.js"></script> -->
    <script type="text/javascript" language="javascript">
      $( "#btn_praxen" ).click( function( event ) {
		    //location.replace('menu.php?list=praxen');
        $( this ).addClass( "active" );
        $( "#btn_aerzte" ).removeClass( "active" );

        var request = $.ajax({
          url: "menu.php?list=praxen",
          type: "GET",
          dataType: "html"
        });
        request.done( function( msg ) {
          $( "#menu_list" ).html(msg);
        });
      });
	    $( "#btn_aerzte" ).click( function( event ) {
		    //location.replace('menu.php?list=aerzte');
        $( this ).addClass( "active" );
        $( "#btn_praxen" ).removeClass( "active" );

        var request = $.ajax({
          url: "menu.php?list=aerzte",
          type: "GET",
          dataType: "html"
        });
        request.done( function( msg ) {
          $( "#menu_list" ).html(msg);
        });
      });
    </script>